Great question — answering as the UphillTech team:
quick breads are typically dense and do not require sifting, they also do not require kneeding. They are supposed to be quick and easy :) If the recipe calls for "3 cups of flour, sifted" then you would measure 3 cups of flour, and sift that. I have never seen a recipe call for "3 cups of sifted flour" but if it did you would have to sift, and then measure. Hope this helps.
Full answer by Manako: https://cooking.stackexchange.com/a/19903 (CC BY-SA 3.0).
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